Respuesta :
[tex]\bf \begin{array}{ccll} students&\$\\ \cline{1-2} 4&12\\ 10&x \end{array}\implies \cfrac{4}{10}=\cfrac{12}{x}\implies \cfrac{2}{5}=\cfrac{12}{x}\implies 2x=60 \\\\\\ x=\cfrac{60}{2}\implies x=30[/tex]
[tex]\bf \begin{array}{ccll} students&\$\\ \cline{1-2} 4&12\\ 10&x \end{array}\implies \cfrac{4}{10}=\cfrac{12}{x}\implies \cfrac{2}{5}=\cfrac{12}{x}\implies 2x=60 \\\\\\ x=\cfrac{60}{2}\implies x=30[/tex]
